Wall covering



FIG. 1 is a perspective view of a wall covering, showing the new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right-side elevational view thereof;

FIG. 4 is a left-side elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines showing a wall and doorway in FIG. 1 are included for the purpose of illustrating the invention in use, and form no part of the claimed design. The rear elevational view does not form a part of the claimed design. 

What is claimed is the ornamental design for a wall covering, as shown and described. 